I've done quite a bit to increase HP on my 4.4i and nothing has had as noticeable of a difference as this.

As much as I don't blame people to be skeptical, no where does this product claim to add any HP.

I can honestly say that I REALLY like what this did to my throttle and I had a problem with how slow my car downshifted before I even knew this existed.

I do find it a little funny that people get a lot of shit for buying this snake oil, but 80% of anyone who races amateur on a sport bike puts a 1/4 turn throttle on their bike. 100% of MOTO GP and WSB bikes have them stock....Same exact concept.